CN108120593B - Regulating valve cavitation diagnostic method and its pilot system - Google Patents
Regulating valve cavitation diagnostic method and its pilot system Download PDFInfo
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- CN108120593B CN108120593B CN201711266298.0A CN201711266298A CN108120593B CN 108120593 B CN108120593 B CN 108120593B CN 201711266298 A CN201711266298 A CN 201711266298A CN 108120593 B CN108120593 B CN 108120593B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
Regulating valve cavitation diagnostic method and its pilot system, for assessing whether diagnosis regulating valve has cavitation generation in the process of running.Regulating valve cavitation diagnostic method step of the invention includes: the flow coefficient k v and fluid reynolds number Re calculated under current aperture according to the upstream side Fluid pressure, downstream side Fluid pressure and the fluid flow that detect, and Re-Kv graph of relation is drawn out, judge whether that cavitation occurs by Re-Kv relation curve graph evaluation.The present invention proposes a kind of pilot system applied to this law, including regulating valve test pipe-line system, signal measurement apparatus, signal acquisition and sending device, cavitation diagnosing software system simultaneously.According to the present invention, fluid Reynolds number-regulating valve flow Relationship of Coefficients curve graph under a certain aperture of regulating valve drawn by cavitation diagnostic software, it accurate can learn that the service condition of cavitation occurs under current aperture for regulating valve, realize the cavitation assessment diagnosis of regulating valve.
Description
Technical field
The present invention relates to regulating valve cavitation diagnostic method and its pilot systems.
Background technique
For regulating valve as the important execution unit in Process Control System, it is that we are heavy that its safety and stability, which is reliably run,
The problem of point concern.Wherein, cavitation is a kind of common phenomenon in regulating valve.
Cavitation is divided into two processes, is flash distillation and cavitation respectively: when flash distillation is that incompressible fluid flows through regulating valve, from contracting
Flow section is when the static pressure of valve outlet decreases to or below saturated vapour pressure of fluid at a temperature of valve inlet, part
Liquid vaporizes the phenomenon that forming vehicle repair major after making valve.
Cavitation is incompressible fluid when flowing through regulating valve, from vena contracta up to valve outlet differential static pressure as low as being equal to or
When lower than saturated vapour pressure of fluid at a temperature of valve inlet, partially liq is vaporized into bubble, and then static pressure is restored to this again
When saturated vapour pressure, the phenomenon that bubble eruption reverts to liquid phase.This bubble generates and the overall process of rupture becomes cavitation.Cavitation
Effect is known as cavitation to the erosion of material.
Cavitation generates serious erosion damage to spool, washes away generation in flow velocity maximum, usually in spool and valve cup ring
Contact line or near.It due to bubbles burst, releases energy, it can cause noise to damage on valve, issue similar drift sand and flow through valve
Cracker, and the energy discharged washes away spool face, and involves downstream line.The characteristic that it can not only influence valve is bent
Line, and will lead to serious noise, vibration, explosion are washed away with the destruction of regulating valve inner part etc..In this case, it adjusts
The reduced service life of valve, the decline of reliable operation type, and then cause declining to a great extent for process system and device productivity.Therefore exist
In actual condition, inevitably to consider the influence of cavitation and make every effort to avoid.
The domestic detection for cavitation at present is not studied more with diagnosis, and tune is needed under many working conditions
Save the assessment of valve cavitation.
Summary of the invention
The present invention will overcome the disadvantages mentioned above of the prior art, provide a kind of regulating valve cavitation diagnostic method and its test system
System, for carrying out cavitation assessment and diagnosis to regulating valve.
Regulating valve cavitation diagnostic method of the invention includes:
The pipeline signal that step 1. passes through the sensor measurement being preset on pipeline regulating valve pipe-line system to be measured；
Step 2. is acquired and saves to the pipeline signal；
The data that step 3. acquires are stored in cavitation diagnosing software system, are carried out data processing, are obtained regulating valve at certain
Flow coefficient k v under one aperture and the pipeline fluid reynolds number Re under respective conditions；
Step 4. draws fluid Reynolds number and discharge coefficient relationship according to the regulating valve flow coefficient and fluid Reynolds number
Curve graph；
Step 5. is according to the fluid Reynolds number and regulating valve flow Relationship of Coefficients curve graph (Re-Kv figure), to be measured
Regulating valve carries out cavitation assessment.
Specifically, the pipe of regulating valve pipe-line system to be measured is acquired described in step 1 by the sensor being preset on pipeline
Road signal, comprising:
11. being preset at the pressure sensor acquisition regulating valve upstream pressure signal P1 of regulating valve upstream side to be measured；
12. being preset at the pressure sensor acquisition regulating valve downstream pressure signal P2 in regulating valve downstream side to be measured；
13. the fluid flow signal Q that the fluid flow transmitter acquisition being preset in pipeline passes through regulating valve to be measured；
Signal acquisition described in step 2, specific steps are as follows:
Step 21: an aperture being set to regulating valve by cavitation diagnosing software system, while being ended before keeping regulating valve
Valve standard-sized sheet, shut-off valve is reached close to the aperture closed entirely after regulating valve, adjusts pressure release circuit, regulating valve upstream pressure is made to reach suitable
Pressure value, regulating valve operates under a relatively low pressure differential at this time.Operation a period of time in this case, and
Acquire regulating valve upstream pressure P1 as described above, regulating valve downstream pressure P2 and fluid flow Q；
Step 22: keeping current control valve opening constant, shut-off valve and pressure release circuit are equally always maintained at before regulating valve
It is constant, end valve opening after being gradually increased regulating valve, adjusting valve differential pressure increases, and during pressure difference increases, is maintained at each
Stable operation for a period of time, and acquires regulating valve upstream pressure P1 as described above under a pressure difference, regulating valve downstream pressure P2
With fluid flow Q；
Step 23: keeping current control valve opening constant, shut-off valve and pressure release circuit are equally always maintained at before regulating valve
Constant, it is standard-sized sheet that valve opening is ended after regulating valve, at this point, adjusting valve differential pressure reaches the maximum value under current operating condition, is stablized
Operation a period of time, and acquire regulating valve upstream pressure P1 as described above, regulating valve downstream pressure P2 and fluid flow Q；
Step 24: control valve opening being changed by cavitation diagnosing software system, re-execute the steps 21~23.
Above-mentioned steps are the process of signal acquisition, after signal acquisition of the regulating valve under all setting apertures is complete, i.e.,
It can carry out the treatment process of data.
The data of above-mentioned acquisition are stored in cavitation diagnosing software system, specific data handling procedure are as follows:
S1. regulating valve upstream pressure P1, regulating valve downstream pressure P2 and stream that regulating valve acquires under a certain aperture are taken out
Body flow Q；
S2. using different adjusting valve differential pressures as node, the regulating valve upstream pressure P1 of acquisition, regulating valve downstream pressure are utilized
P2 and fluid flow Q calculates the flow coefficient k v and fluid reynolds number Re under this control valve opening under different pressure differentials；
S3. regulating valve flow COEFFICIENT K v passes throughIt is calculated, wherein N1For constant, 0.1, ρ/ρ is generally taken0For
Relative density, 5-40 degrees Celsius of medium of water are taken as 1；
Reynolds number (Re) passes throughIt is calculated, wherein ρ is Media density, and v is fluid velocity, passes through formula
It is calculated, d is a characteristic length.Fluid flows through circular pipe, and d is the equivalent diameter of pipeline, and μ is fluid viscosity coefficient；
S4. last cavitation diagnosing software system is drawn according to the regulating valve flow COEFFICIENT K v and fluid reynolds number Re of above-mentioned calculating
Produce Re-Kv relation curve.
It is consistent with the above process for the data handling procedure of regulating valve different opening, it finally obtains regulating valve and is in difference
A series of Re-Kv relation curves under aperture；
Cavitation assessment diagnosis is carried out to regulating valve according to the Re-Kv relation curve of drafting.In general, regulating valve is in normal fortune
It is a stationary value in the flow coefficient k v of a certain aperture, as fluid reynolds number Re increases, flow coefficient k v occurs in row situation
The point that trend is obviously reduced can determine that the point taken place for cavitation, and Kv value decreasing value is bigger, and cavitation situation is more serious.
It judges by accident in order to prevent, above-mentioned signal acquisition process is acquired into a same number according to the sequence of step 3~1 again
According to flow coefficient k v can be seen after the trend for occurring being obviously reduced, and with the reduction of fluid Reynolds number, discharge coefficient is returned again
Normal value under a certain aperture.At this point it is possible to which determination starts in the point that trend occurs being obviously reduced in flow coefficient k v for cavitation
The point of generation.
In above-mentioned data handling procedure, participate in calculate regulating valve upstream pressure P1, regulating valve downstream pressure P2 and
Fluid flow Q is the data acquired when pipeline stable operation after pressure difference changes.Meanwhile there are wave phenomenons for pipeline fluid, cause
Regulating valve upstream pressure P1 is acquired, regulating valve downstream pressure P2 and fluid flow Q can be fluctuated in a certain range, therefore, be adjusted
It is essential step that valve upstream pressure P1, regulating valve downstream pressure P2 and fluid flow Q, which take the average value in certain time,.
The present invention also provides a kind of pilot systems using above-mentioned regulating valve cavitation diagnostic method, which is characterized in that packet
It includes: by shut-off valve after shut-off valve 3, regulating valve to be measured before centrifugal multistage pump multiple centrifugal pump 1, pressure release circuit 2, regulating valve to be measured 5, regulating valve to be measured
8 regulating valves for being connected with each other composition test pipe-line system, wherein the outlet of centrifugal multistage pump multiple centrifugal pump 1 and shut-off valve 3 before regulating valve to be measured
It is connected with pressure release circuit 2,5 upstream side of regulating valve to be measured connects shut-off valve 3 before regulating valve to be measured, and 5 downstream side of regulating valve to be measured connects
Shut-off valve 8 after regulating valve is surveyed in reception；
The line upstream side of regulating valve 5 to be measured is equipped with upstream side pressure sensor 6 and fluid flow transmitter 4, to be measured
The pipe line downstream side of regulating valve 5 is equipped with downstream side pressure sensor 7, the output end of fluid flow transmitter 4, regulating valve upstream
The output end of side pressure sensor 6 and the output end of regulating valve downstream side pressure sensor 7 are connected to signal acquisition and send and fill
Set 9；
Signal acquisition and sending device 9 are the data collection system of National Instruments company, its first
Output end connects regulating valve 5 to be measured, signal acquisition and sending device 9 and cavitation diagnosing software system 10 passes through Ethernet two-way
News；Signal acquisition and sending device 9 receive the data acquisition command from cavitation diagnosing software system 10, signal acquisition and transmission
Device 9 receives the signal of the sensor acquisition according to the data acquisition command received, and the signal of acquisition is sent back-steam
Lose diagnosing software system.Regulating valve to be measured is needed the valve position signal reached to be sent to signal acquisition by cavitation diagnosing software system 10
With sending device 9, signal acquisition and sending device 9 send the control signal of 4-20mA to tune to be measured according to the valve position signal of acquisition
Valve is saved, realizes the opening size for controlling regulating valve to be measured.
Cavitation diagnosing software system 10 is the cavitation diagnostic software write based on LABVIEW, including data acquisition command hair
Module 10-1 is sent, output data acquisition is to signal acquisition and sending device 9；
Control valve position controls signal setup module 10-2, and the control valve position signal to be measured of setting is sent to signal and is adopted
Collection and sending device 9；
The acquisition of input terminal connection signal and the sending device 9 of data storage module 10-3, saves the sensor acquisition
Data；The input terminal of Data Management Analysis module 10-4 connects data storage module 10-3, Data Management Analysis module 10-4 root
Above-mentioned data handling procedure is carried out according to the data of preservation.
The output end of Data Management Analysis module 10-4 connects data processing display module 10-5, data processing display module
10-5 is for showing data processed result.
Regulating valve is tested in pipe-line system, and pressure release circuit 2 adjusts the upstream side pressure of shut-off valve 3 before regulating valve；Tune to be measured
Section valve 5 is the flow restriction equipment with intelligent positioner；Shut-off valve 8 after shut-off valve 3 and regulating valve to be measured before regulating valve to be measured
For flow restriction equipment, the upstream pressure and downstream pressure of regulating valve 5 to be measured are adjusted respectively；Above-mentioned regulating valve upstream side pressure passes
The installation site of sensor 6, regulating valve downstream side pressure sensor 7 and fluid flow transmitter 4 in pipeline is in strict accordance with national standard
GB/T 17213.9-2005 regulation enforcement.
Diagnosis principle of the invention are as follows: when being in turbulent condition by the fluid of regulating valve, regulating valve is in each aperture
Under discharge coefficient be certain value, its size is related with the structure inside regulating valve.The phenomenon that generating from above-mentioned cavitation is come
It sees, when cavitation occurs, fluid is the gentle two-phase mixture of water, can be reduced so as to cause the relative mass of water, by regulating valve
It is found that under identical pressure difference, the flow of water reduces the calculation formula of discharge coefficient, and discharge coefficient is caused to reduce.It is reacted to Re-
In Kv relation curve, as pressure difference increases, fluid Reynolds number increases, and cavitation occurs if putting at some, discharge coefficient has obviously
Downward trend.
The invention has the advantages that passing through fluid Reynolds number-tune under a certain aperture of regulating valve that cavitation diagnostic software is drawn
Valve discharge coefficient graph of relation is saved, accurate can learn that the service condition of cavitation occurs under current aperture for regulating valve,
Realize the cavitation assessment diagnosis of regulating valve.
Detailed description of the invention
Fig. 1 is cavitation diagnostic test system diagram of the invention.
Fig. 2 is cavitation diagnosing software system structure chart of the invention.
Fig. 3 is the regulating valve valve body structure schematic diagram that the present invention detects.
Fig. 4 is the pressure change schematic diagram that cavitation phenomenons of the present invention generate.
Fig. 5 is the graph of relation of fluid Reynolds number and regulating valve flow coefficient of the invention.
Specific embodiment
Hereinafter, the embodiments of the present invention will be described with reference to the drawings.
Symbol description in attached drawing: 1. centrifugal multistage pump multiple centrifugal pumps, 2. pressure release circuits, shut-off valve before 3. regulating valves, 4. fluid flows become
Send device, 5. regulating valves, 6. upstream side fluid pressure sensors, 7. downstream side fluid pressure sensors, shut-off valve after 8. regulating valves,
9. signal acquisition and sending device, 10. cavitation diagnosing software systems, 11. valve rods, 12. upper cover plates, 13. fillers, 14. bonnet,s,
15. spool, 16. valve seats, 17. valve bodies.
Fig. 1 is regulating valve cavitation diagnostic test system diagram of the invention, and wherein regulating valve tests pipe-line system, including multistage
Shut-off valve 8 and connection after shut-off valve 3, regulating valve to be measured before centrifugal pump 1, pressure release circuit 2, regulating valve to be measured 5, regulating valve to be measured
Pipeline, for providing the test environment for thering is load (thering is medium to flow through) to run to regulating valve to be measured；
Signal measurement apparatus, the pressure sensor 6 including regulating valve upstream side, the pressure sensor 7 in regulating valve downstream side,
Fluid flow transmitter 4 is mounted in test pipe-line system, for measuring pipeline run signal；
Signal acquisition and sending device 9 are connect, for acquiring the pipe of measurement with signal measurement apparatus and adjusting valve positioner
Road signal and transmission adjust valve control signal；
Cavitation diagnosing software system 10 is filled for preservation acquisition signal and analysis processing signal with signal acquisition and transmission
Set connection.
Specifically, centrifugal multistage pump multiple centrifugal pump 1 is the equipment of trandfer fluid medium in pipeline in regulating valve test pipe-line system；It lets out
Road 2 is pushed back, for adjusting the upstream side pressure of shut-off valve 3 before regulating valve；
Regulating valve 5 to be measured is the flow restriction equipment with intelligent positioner；
Shut-off valve 8 is flow restriction equipment after shut-off valve 3 and regulating valve to be measured before regulating valve to be measured, can be used for adjusting to be measured
The upstream pressure and downstream pressure of regulating valve 5；
Signal acquisition and sending device 9 are that the data of the tape controller of National Instruments company acquire system
System；
Cavitation diagnosing software system 10 includes data acquisition command for the cavitation diagnostic software write based on LABVIEW
It sends, adjust valve control signal transmission, data save and the functions such as Data Management Analysis.By way of network and signal acquisition
It is connect with sending device.
5 valve body structure of regulating valve of the present invention between spool 15 and valve seat 16 as shown in figure 3, form a contracting stream
Section, from the schematic diagram of Fig. 4 it can also be seen that from vena contracta up to the static pressure P2 of valve outlet decreases to or below the stream
Saturated vapour pressure P of body at a temperature of valve inletvcWhen, partially liq vaporizes the phenomenon that forming vehicle repair major after making valve and is called sudden strain of a muscle
It steams, from vena contracta up to the static pressure P2 of valve outlet decreases to or below saturated vapor of fluid at a temperature of valve inlet
Press PvcWhen, partially liq is vaporized into bubble, and then static pressure P2 is restored to saturated vapour pressure P againvcOn when, bubble eruption is extensive
The phenomenon that being again liquid phase, is called cavitation, and cavitation is known as cavitation to the erosion of material.
In one embodiment of the invention, regulating valve cavitation diagnostic method step includes:
Pass through the pipeline signal of the sensor measurement being preset on pipeline regulating valve pipe-line system to be measured；
The pipeline signal is acquired and is saved；
The pipeline signal is handled by specific formulation, obtains flow coefficient k v of the regulating valve under a certain aperture
With the pipeline fluid reynolds number Re under respective conditions；
According to the regulating valve flow coefficient and fluid Reynolds number, fluid Reynolds number and discharge coefficient relation curve are drawn
Figure；
According to the fluid Reynolds number and regulating valve flow Relationship of Coefficients curve graph, i.e. Re-Kv figure, to regulating valve to be measured
Carry out cavitation assessment.
Specifically, acquiring the pipeline signal of regulating valve pipe-line system to be measured by the sensor being preset on pipeline, comprising:
The pressure sensor 6 for being preset at regulating valve upstream side to be measured acquires regulating valve upstream pressure signal P1；
The pressure sensor 7 for being preset at regulating valve downstream side to be measured acquires regulating valve downstream pressure signal P2；
The fluid flow signal Q that the acquisition of fluid flow transmitter 4 being preset in pipeline passes through regulating valve to be measured；
Wherein, installation site of the sensor in pipeline is held in strict accordance with national standard GB/T 17213.9-2005 specification
Row.
Above-mentioned signal measurement apparatus is connect with signal acquisition with sending device 9, carries out the acquisition of data, and passes through network
It is connect with cavitation diagnosing software system 10, data is saved.
The specific steps of signal acquisition are as follows:
Step 1: an aperture being set to regulating valve 5 by cavitation diagnosing software system 10, while being cut before keeping regulating valve
Only 3 standard-sized sheet of valve, shut-off valve 8 is reached close to the aperture closed entirely after regulating valve, is adjusted pressure release circuit 2, is reached 5 upstream pressure of regulating valve
To suitable pressure value, regulating valve is operated under a relatively low pressure differential at this time.One section is run in this case
Time, and acquire 5 upstream pressure P1 of regulating valve as described above, regulating valve 5 downstream pressure P2 and fluid flow Q；
Step 2: keeping current 5 aperture of regulating valve constant, shut-off valve 3 and pressure release circuit 2 are equally protected always before regulating valve
It holds constant, is gradually increased 8 aperture of shut-off valve after regulating valve, adjusting valve differential pressure increases, and during pressure difference increases, is maintained at every
Stable operation for a period of time, and acquires 5 upstream pressure P1 of regulating valve as described above under one pressure difference, presses after 5 valve of regulating valve
Power P2 and fluid flow Q；
Step 3: keeping current 5 aperture of regulating valve constant, shut-off valve 3 and pressure release circuit 2 are equally protected always before regulating valve
To hold constant, 8 aperture of shut-off valve is standard-sized sheet after regulating valve, at this point, 5 pressure difference of regulating valve reaches the maximum value under current operating condition,
Stable operation for a period of time, and acquires 5 upstream pressure P1 of regulating valve as described above, 5 downstream pressure P2 of regulating valve and fluid stream
Measure Q；
Step 4: 5 aperture of regulating valve being changed by cavitation diagnosing software system 10, re-execute the steps 1~3.
Above-mentioned steps are the process of signal acquisition, after signal acquisition of the regulating valve under all setting apertures is complete, i.e.,
It can carry out the treatment process of data.
The data of above-mentioned acquisition are stored in cavitation diagnosing software system 10, specific data handling procedure are as follows:
Take out the 5 upstream pressure P1 of regulating valve that regulating valve acquires under a certain aperture, 5 downstream pressure P2 of regulating valve and fluid
Flow Q；
It is pressed after 5 valve of regulating valve for node using the 5 upstream pressure P1 of regulating valve of acquisition according to different adjusting valve differential pressures
Power P2 and fluid flow Q calculates the flow coefficient k v and fluid Reynolds number under this control valve opening under different pressure differentials
Re；
Regulating valve flow COEFFICIENT K v passes throughIt is calculated, wherein N1For constant, 0.1, ρ/ρ is generally taken0It is opposite
The water of density, 5-40 degrees Celsius of general medium is taken as 1；
Reynolds number Re passes throughIt is calculated, wherein ρ is Media density, and v is fluid velocity, passes through formulaMeter
It obtains, d is a characteristic length.Fluid flows through circular pipe, and d is the equivalent diameter of pipeline, and μ is fluid viscosity coefficient；
Finally using cavitation diagnosing software system 10 according to the regulating valve flow COEFFICIENT K v and fluid Reynolds number of above-mentioned calculating
Re draws out Re-Kv relation curve.
It is consistent with the above process for the data handling procedure of regulating valve different opening, it finally obtains regulating valve 5 and is in not
With a series of Re-Kv relation curves under aperture；Fig. 5 is to be according to a series of Re-Kv relation curves for drawing out of test, three
The curve of synteny does not indicate the Re-Kv relation curve under different adjustment valve opening.According to the Re-Kv relation curve of drafting we
Cavitation assessment diagnosis can be carried out to regulating valve.It is seen from fig 5 that when regulating valve is under normal operation, a certain
The flow coefficient k v of aperture is a stationary value, and as fluid reynolds number Re increases, flow coefficient k v occurs that trend is obviously reduced
Point can quickly determine the point that cavitation takes place according to curve graph.Kv value decreasing value is bigger, and cavitation situation is more serious.
It judges by accident in order to prevent, above-mentioned signal acquisition process is acquired into a same number according to the sequence of step 3~1 again
According to flow coefficient k v can be seen after the trend for occurring being obviously reduced, and with the reduction of fluid Reynolds number, discharge coefficient is returned again
Normal value under a certain aperture.At this point it is possible to which determination starts in the point that trend occurs being obviously reduced in flow coefficient k v for cavitation
The point of generation.
According to above embodiment, it can be deduced that the service condition of cavitation occurs under each aperture for the regulating valve 5, real
Now the more complete cavitation of regulating valve 5 is assessed and is diagnosed.
In above-mentioned data handling procedure, the 5 upstream pressure P1 of regulating valve, 5 downstream pressure P2 of regulating valve calculated is participated in
It is the data acquired when pipeline stable operation after pressure difference changes with fluid flow Q.Meanwhile there are wave phenomenons for pipeline fluid, lead
Acquisition regulating valve upstream pressure P1 is caused, regulating valve downstream pressure P2 and fluid flow Q can be fluctuated in a certain range, therefore, be adjusted
It is essential step that section valve upstream pressure P1, regulating valve downstream pressure P2 and fluid flow Q, which take the average value in certain time,
Suddenly.
In the above-described embodiment, it signal acquisition and the sequence of data processing and is not fixed, at signal acquisition and data
It manages while carrying out also belonging to one of embodiments of the present invention.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range also and in those skilled in the art conceive according to the present invention it is conceivable that equivalent technologies mean.
Claims (5)
1. regulating valve cavitation diagnostic method, comprising:
Step 1. is specifically included by the pipeline signal of the sensor measurement being preset on pipeline regulating valve pipe-line system to be measured:
11. being preset at the pressure sensor acquisition regulating valve upstream pressure signal P1 of regulating valve upstream side to be measured；
12. being preset at the pressure sensor acquisition regulating valve downstream pressure signal P2 in regulating valve downstream side to be measured；
13. the fluid flow signal Q that the fluid flow transmitter acquisition being preset in pipeline passes through regulating valve to be measured；
Step 2. is acquired and saves to the pipeline signal, and the specific steps of the signal acquisition include:
Step 21: an aperture being set to regulating valve by cavitation diagnosing software system, while being ended before keeping regulating valve to be measured
Valve standard-sized sheet, shut-off valve is reached close to the aperture closed entirely after regulating valve to be measured, is adjusted pressure release circuit, is reached regulating valve upstream pressure
Suitable pressure value, regulating valve operates under a relatively low pressure differential at this time, when running one section in this case
Between, and regulating valve upstream pressure signal P1 as described above is acquired, regulating valve downstream pressure signal P2 and fluid flow signal Q；
Step 22: keeping current control valve opening constant, shut-off valve and pressure release circuit are equally always maintained at before regulating valve to be measured
It is constant, end valve opening after being gradually increased regulating valve to be measured, adjusting valve differential pressure increases, and during pressure difference increases, is maintained at
Stable operation for a period of time, and acquires regulating valve upstream pressure P1 as described above under each pressure difference, presses after regulating valve valve
Power P2 and fluid flow Q；
Step 23: keeping current control valve opening constant, shut-off valve and pressure release circuit are equally always maintained at before regulating valve to be measured
Constant, it is standard-sized sheet that valve opening is ended after regulating valve to be measured, at this point, adjusting valve differential pressure reaches the maximum value under current operating condition,
Stable operation for a period of time, and acquires regulating valve upstream pressure P1 as described above, regulating valve downstream pressure P2 and fluid flow
Q；
Step 24: control valve opening being changed by cavitation diagnosing software system, re-execute the steps 21~23；
The data that step 3. acquires are stored in cavitation diagnosing software system, carry out data processing, specifically:
The pipeline signal is handled by following formula, obtains flow coefficient k v of the regulating valve under a certain aperture and right
Pipeline fluid reynolds number Re under the conditions of answering；Regulating valve flow COEFFICIENT K v passes throughIt is calculated, wherein N1For constant,
Take 0.1, ρ/ρ0Density for relative density, 5-40 degrees Celsius of water is taken as 1；Reynolds number Re passes throughIt is calculated, wherein ρ
For Media density, v is fluid velocity, passes through formulaIt is calculated, d is the equivalent diameter of circular pipe, and μ is viscous for fluid
Property coefficient；
Step 4. draws fluid Reynolds number and discharge coefficient relation curve according to the regulating valve flow coefficient and fluid Reynolds number
Figure；
Step 5. carries out cavitation according to the fluid Reynolds number and regulating valve flow Relationship of Coefficients curve graph, to regulating valve to be measured
Assessment: regulating valve is under normal operation, is a stationary value in the flow coefficient k v of a certain aperture, with fluid Reynolds number
Re increases, and the point that trend occurs being obviously reduced in flow coefficient k v is determined as the point that cavitation takes place, and Kv value decreasing value is bigger, vapour
It is more serious to lose situation.
2. regulating valve cavitation diagnostic method as described in claim 1, it is characterised in that: in above-mentioned step 3 data processing
Cheng Zhong participates in the regulating valve upstream pressure signal P1 calculated, and regulating valve downstream pressure signal P2 and fluid flow signal Q take centainly
Average value in time.
3. a kind of pilot system for applying regulating valve cavitation diagnostic method as described in claim 1, which is characterized in that including by
It is cut after shut-off valve (3), regulating valve to be measured before centrifugal multistage pump multiple centrifugal pump (1), pressure release circuit (2), regulating valve to be measured (5), regulating valve to be measured
The regulating valve that only valve (8) is connected with each other composition tests pipe-line system, wherein before the outlet of centrifugal multistage pump multiple centrifugal pump (1) and regulating valve to be measured
Shut-off valve (3) and pressure release circuit (2) connection, regulating valve (5) upstream side to be measured connects shut-off valve (3) before regulating valve to be measured, to be measured
Regulating valve (5) downstream side connects shut-off valve (8) after regulating valve to be measured；
The line upstream side of regulating valve (5) to be measured is equipped with upstream side pressure sensor (6) and fluid flow transmitter (4), to
The pipe line downstream side for surveying regulating valve (5) is equipped with downstream side pressure sensor (7), and the output end of fluid flow transmitter (4) is adjusted
The output end of the output end and regulating valve downstream side pressure sensor (7) that save valve upstream side pressure sensor (6) is connected to signal
Acquisition and sending device (9)；
Signal acquisition and sending device (9) are the data collection system of National Instruments company, its first is defeated
Outlet connects regulating valve (5) to be measured, and signal acquisition and sending device (9) and cavitation diagnosing software system (10) are double by Ethernet
To communication；Signal acquisition and sending device (9) receive the data acquisition command for coming from cavitation diagnosing software system (10), and signal is adopted
Collection receives the signal of the sensor acquisition with sending device (9) according to the data acquisition command that receives, and by the letter of acquisition
Number send back cavitation diagnosing software system；Regulating valve to be measured is needed the valve position signal reached by cavitation diagnosing software system (10)
It is sent to signal acquisition and sending device (9), signal acquisition and sending device (9) are according to the valve position signal of acquisition transmission 4-20mA
Control signal to regulating valve to be measured, realize the opening size for controlling regulating valve to be measured；
Cavitation diagnosing software system (10) is the cavitation diagnostic software write based on LABVIEW, including data acquisition command is sent
Module (10-1), output data acquisition is to signal acquisition and sending device (9)；
Control valve position controls signal setup module (10-2), and the control valve position signal to be measured of setting is sent to signal acquisition
With sending device (9)；
The acquisition of input terminal connection signal and sending device (9) of data storage module (10-3), save the sensor acquisition
Data；The input terminal of Data Management Analysis module (10-4) connects data storage module (10-3), Data Management Analysis module
(10-4) carries out above-mentioned data handling procedure according to the data of preservation；
The output end of Data Management Analysis module (10-4) connects data processing display module (10-5), data processing display module
(10-5) is for showing data processed result.
4. pilot system as claimed in claim 3, it is characterised in that: regulating valve is tested in pipe-line system, and pressure release circuit (2) are adjusted
Save the upstream side pressure of shut-off valve (3) before regulating valve to be measured；
Regulating valve (5) to be measured is the flow restriction equipment with intelligent positioner；
Shut-off valve (8) is flow restriction equipment after shut-off valve (3) and regulating valve to be measured before regulating valve to be measured, adjusts tune to be measured respectively
Save the upstream pressure and downstream pressure of valve (5).
5. pilot system as claimed in claim 3, it is characterised in that: above-mentioned regulating valve upstream side pressure sensor (6) is adjusted
The installation site of valve downstream side pressure sensor (7) and fluid flow transmitter (4) in pipeline is in strict accordance with national standard GB/T
17213.9-2005 regulation enforcement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109668723B (en) * | 2019-01-25 | 2020-11-10 | 浙江工业大学 | Regulating valve cavitation diagnosis system and diagnosis method thereof |
| CN110672315B (en) * | 2019-06-14 | 2022-05-13 | 国网浙江省电力有限公司电力科学研究院 | Steam turbine regulating valve state evaluation method based on valve rod steam leakage |
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| CN111504633A (en) * | 2020-04-28 | 2020-08-07 | 浙江工业大学 | Regulating valve cavitation diagnosis system based on vibration acceleration and diagnosis method thereof |
| CN112595491B (en) * | 2021-03-02 | 2021-09-28 | 北京星际荣耀空间科技股份有限公司 | Cavitation pipe liquid flow test method |
| CN113280983A (en) * | 2021-04-21 | 2021-08-20 | 浙江工业大学 | On-line diagnosis method for internal leakage of pneumatic regulating valve |
| CN113205248B (en) * | 2021-04-27 | 2023-03-24 | 西安热工研究院有限公司 | Regulating valve fault early warning system and method based on big data medium parameter diagnosis |
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| CN201926603U (en) * | 2011-01-21 | 2011-08-10 | 大连海事大学 | Cavitation test device for testing material properties |
| CN102175423A (en) * | 2011-01-28 | 2011-09-07 | 上海理工大学 | Device and experimental method for visualization research on labyrinth channel in high pressure regulating valve |
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Application publication date: 20180605 Assignee: ZHEJIANG XINJING AIR CONDITIONING EQUIPMENT CO.,LTD. Assignor: JIANG University OF TECHNOLOGY Contract record no.: X2023980037345 Denomination of invention: Diagnosis Method and Test System for Regulating Valve Cavitation Granted publication date: 20191018 License type: Common License Record date: 20230703 |